PLATE XIX. 



FIG. 144. a. 



Structure of Human Hair. 



FIG. 145. 



Connective-tissue elements. From the Frog's Thigh : 

 a, contracted cell; ft, ramified ; c, d, motionless gran- 

 ular cells; /, fibrilise; g, connective-tissue bundle; 

 , elastic fibre net-work. 



Development of the enamel: a, dental ridge; 

 6, young layer of epithelium; c, deep layer; d t 

 enamel germ ; e, enamel organ ; /, dental germ. 



FIG. 146. 



White Fibrous Tissue, from Ligament. 



FIG. 147. 



Yellow Fibrous Tissue, from Ligamentum Nuchse 

 of Calf. 



FIG. 148. 



Fatty Tissue. 



